The Basaas Extension brings your notifications to your browser. Of course, you can set the notifications. See how it works:
(De-) Activate notifications
1. Right-click on the Extension in your browser bar
2. Click on "Options"
3. Activate or deactivate the option "Receive notifications".
Decide when you want to get notified about an upcoming event
1. Open the option from your extension
2. Choose the time when you want to get notified about an upcoming appointment